I found the issue.. I had the BB service account as a Domain Admin.
I found this in this thread: blackberryforums.com/general-blackberry-discussion/34073-outlook-calendar-not-syncing.html
Originally Posted by gibson_hg
If cdo is not the issue then it is most likely permissions. The BESAdmin account CANNOT be a domain admin or an admin of any kind. This revokes the Send As permission used to for Calendaring. The BESAdmin can only be in the built-in admins when the BES is installed on a Domain Controller, that's the only exception. If the BESAdmin is not part of any admin groups then check for the Send As permission in Exchange System Manager. Verify it is set at the server, mailbox store and public folder store levels.